I met a new word "pitch in" but I don't know what does that mean,can you tell me?Thank you very much!
here is the sentance"International relief agencies also picth in to help for earthquake relief.
Set to work vigorously, as in We pitched right in and started mowing the field. [Colloquial; second half of 1800s]
Join forces with others; help, cooperate. For example, We were hoping you'd pitch in and sort the books. Also see pitch into.
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