To contribute to the effectiveness or improvement of (something); improve or advance:
(Intransitive) To enlist oneself as a volunteer.
To provide assistance, support, or relief:
To cause physical damage to (something); harm:
To hinder is defined as to restrain or hold something back.
To keep (a person or thing) from doing something; impede:
Find another word for pitch-in. In this page you can discover 11 synonyms, antonyms, idiomatic expressions, and related words for pitch-in, like: help, volunteer, work, aid, chip in, contribute work, lend-a-hand, hurt, hinder, dig-in and prevent.