ATRC, at, Athyrium attenuatum, atta nable accuracy, at one's invitation, atriocommissuropexy, at the first setout, at hourly intervals, at the peep of dawn, attitudinal changes, at a rough estimate, at the bare idea of
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at one/this etc. remove idiom, at peace idiom, at sb's beck and call idiom, at sb's elbow idiom, at short notice idiom, at sixes and sevens idiom, at stake idiom, ... at that idiom, 返回 at sea