How to use 合う as a Compound Verb
合う by itself means to fit, match, correspond or something similar to that. It can also be stuck to the end of other verbs to create compound verbs.
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In a compound verbs, most of the time the first verb has most of the meaning. The second verb adds extra information to the first verb.
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合う as a Compound Verb
合う is common as a compound verb. It adds the meaning of doing something together, mutually, or with each-other to the verb it follows.
話す + 合う → 話し合う
talk + together → talk together, discuss something
助ける + 合う → 助け合う
help + each-other → Help each-other
向く + 合う → 向き合う
face + each-other → Face each-other