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to exchange glances; to look at each other
to postpone; to put off; to withhold; to abandon
to contrast; to compare
突然の音に驚いて二人は顔を見合せた。
Startled by the sudden sound, the two looked at each other.
お互いに顔を見合せて笑い出した。
They looked at each other and burst out laughing.
答えに困って隣の人と顔を見合せてしまった。
Unable to answer, I ended up exchanging glances with the person next to me.