throw in the towel vs throw in

throw in the towel and throw in both are verbs.

Word	Noun	Adjective	Verb	Adverb
throw in the towel	No	No	Yes	No
throw in	No	No	Yes	No

As verbs, throw in the towel and throw in are synonyms defined as:

throw in the towel and throw in: give up in the face of defeat of lacking hope; admit defeat

Other synonyms of throw in the towel include chuck up the sponge, drop by the wayside, drop out, fall by the wayside, give up, quit.

throw in the towel (verb)	throw in (verb)
give up in the face of defeat of lacking hope; admit defeat	to insert between other elements
	give up in the face of defeat of lacking hope; admit defeat
	add as an extra or as a gratuity