MDBG Mobile Chinese English Dictionary (iPhone, Android, Windows Phone)

叹气	tàn qì	to sigh / to heave a sigh
感慨	gǎn kǎi	to sigh with sorrow, regret etc / rueful / deeply moved
叹惜	tàn xī	sigh of regret
感叹	gǎn tàn	to sigh (with feeling) / to lament
叹口气	tàn kǒu qì	to sigh
唉声叹气	āi shēng tàn qì	sighing voice, wailing breath (idiom) / to heave deep sighs / to sigh in despair
望而兴叹	wàng ér xīng tàn	to sigh (in dismay, admiration etc)
风声鹤唳	fēng shēng hè lì	lit. wind sighing and crane calling (idiom) / fig. to panic at the slightest move / to be jittery
叹息	tàn xī	to sigh; to gasp (in admiration)
唉	āi	interjection or grunt of agreement or recognition (e.g. yes, it's me!) / to sigh
悲叹	bēi tàn	to bewail / to sigh mournfully / to lament
悲叹	bēi tàn	to bewail / to sigh mournfully / to lament
唧唧	jī jī	(onom.) chirping of insects, sighing noise etc
欸	āi	(indicating response) / (sadly sighing) / also pr. [ei4]
欸	ǎi	(Tw) (literary) to rebuke loudly / (Tw) (literary) to sigh / used in 欸乃
舒一口气	shū yī kǒu qì	to heave a sigh of relief
诶	xī	sigh (to express regret)
唏嘘	xī xū	(onom.) to sigh / to sob
感喟	gǎn kuì	sighing with emotion
慨叹	kǎi tàn	to sigh with regret / lament