diff --git a/src/collectors.m4 b/src/collectors.m4
index d7d8fff..0d10175 100644
--- a/src/collectors.m4
+++ b/src/collectors.m4
@@ -1,6 +1,30 @@
 m4_define([_COLLECTOR_FEEDBACK], [m4_fatal($@)])
 
 
+dnl
+dnl $1: The key
+m4_define([_FORMAT_MISSING_PREFIX], [m4_do(
+	[[The prefix for option '$1' has not been found]],
+)])
+
+dnl
+dnl $1: The argname(i.e. storage key)
+dnl $2: The prefix
+m4_define([STORE_NEGATION_PREFIX], [m4_do(
+	[m4_define([_NEG_PREFIX_FOR_$1], [[$2]])],
+)])
+
+
+dnl
+dnl $1: The argname(i.e. storage key)
+dnl $2: Error-handling callback that is given the error message as the first argument.
+m4_define([GET_NEGATION_PREFIX], [m4_do(
+	[m4_ifndef([_NEG_PREFIX_FOR_$1],
+		[m4_default([$2], [m4_fatal])([_FORMAT_MISSING_PREFIX([$1])])],
+		[m4_quote(m4_indir([_NEG_PREFIX_FOR_$1]))])],
+)])
+
+
 dnl
 dnl $1: The argument name
 dnl $2: The help message
@@ -363,6 +387,26 @@ argbash_api([ARG_OPTIONAL_BOOLEAN], _CHECK_PASSED_ARGS_COUNT(1, 4)[m4_do(
 )])
 
 
+dnl $1: long name, var suffix (translit of [-] -> _)
+dnl $2: short name (opt)
+dnl $3: help
+argbash_api([ARG_OPTIONAL_SWITCH_ON], _CHECK_PASSED_ARGS_COUNT(1, 3)[m4_do(
+	[[$0($@)]],
+	[_ADD_OPTIONAL_ARGUMENT_IF_POSSIBLE([$1], [$2], [$3], [off], [bool])],
+)])
+
+
+dnl $1: long name, var suffix (translit of [-] -> _)
+dnl $2: short name (opt)
+dnl $3: help
+dnl $4: the negation prefix (=no-, resulting in i.e. --no-video)
+argbash_api([ARG_OPTIONAL_SWITCH_OFF], _CHECK_PASSED_ARGS_COUNT(1, 4)[m4_do(
+	[[$0($@)]],
+	[STORE_NEGATION_PREFIX([$1], m4_default([[$4]], [[no-]]))],
+	[_ADD_OPTIONAL_ARGUMENT_IF_POSSIBLE([$1], [$2], [$3], [on], [bool])],
+)])
+
+
 m4_define([_ARG_OPTIONAL_ACTION],
 	[_ADD_OPTIONAL_ARGUMENT_IF_POSSIBLE([$1], [$2], [$3], [$4], [action])])
 
diff --git a/tests/unittests/check-arguments.m4 b/tests/unittests/check-arguments.m4
index 3d9dcd4..57f954d 100644
--- a/tests/unittests/check-arguments.m4
+++ b/tests/unittests/check-arguments.m4
@@ -44,6 +44,9 @@ assert_equals([not single], _CATH_IS_SINGLE_VALUED(m4_list_nth([_ARGS_CATH], 4),
 
 _DISCARD_VALUES_FOR_ALL_ARGUMENTS()
 
+assert_equals(m4_list_len([_ARGS_LONG]), 0)
+
+
 ARG_OPTIONAL_SINGLE([foo], [f], [Help,BOMB], [Default])
 ARG_POSITIONAL_SINGLE([defaultless], [xhelp])
 ARG_POSITIONAL_MULTI([multi-BOMB], [help-BOMB], 3, [one], [two])
@@ -106,3 +109,14 @@ m4_popdef([_COLLECTOR_FEEDBACK])
 
 assert_equals(_VERSION_PRINTF_COMMAND([], [1.2]), [printf '%s %s\n\n%s\n' "" "1.2" ''])
 assert_equals(_VERSION_PRINTF_COMMAND(["hello"], [1.2]), [printf '%s %s\n\n%s\n%s\n' "" "1.2" '' "hello"])
+
+_DISCARD_VALUES_FOR_ALL_ARGUMENTS()
+
+ARG_OPTIONAL_SWITCH_ON([foo], [f])
+assert_equals_list_element([_ARGS_LONG], 1, [foo])
+assert_equals_list_element([_ARGS_DEFAULT], 1, [off])
+
+ARG_OPTIONAL_SWITCH_OFF([bar], [b], , [BOMB])
+assert_equals_list_element([_ARGS_LONG], 2, [bar])
+assert_equals_list_element([_ARGS_DEFAULT], 2, [on])
+assert_equals(GET_NEGATION_PREFIX([bar]), [BOMB])
diff --git a/tests/unittests/check-collectors.m4 b/tests/unittests/check-collectors.m4
new file mode 100644
index 0000000..6be3fb0
--- /dev/null
+++ b/tests/unittests/check-collectors.m4
@@ -0,0 +1,12 @@
+m4_include([collectors.m4])
+
+m4_include([test-support.m4])
+
+
+m4_define([SAVE], [m4_define([SAVED], [$1])])
+
+GET_NEGATION_PREFIX([BOMB], [SAVE])
+assert_equals(SAVED, _FORMAT_MISSING_PREFIX([BOMB]))
+
+STORE_NEGATION_PREFIX([lol], [BOMB])
+assert_equals(GET_NEGATION_PREFIX([lol]), [BOMB])