acting or done in a secret or dishonest way 秘密地;奸诈地 underhand dealings. 秘密交易。
another term for underarm: 同 underarm: underhand bowling. 投低手球。 [as adv.]I served underhand. 我投出低手球。 ■with the palm of the hand upward or outward 手心向上(或向外)的 an underhand grip. 手心向上紧握。
语源
Old English in the sense 'in or into subjection, under control' (see under-, hand)