bowl over

to make a strong impression on (someone) with something unexpected she was bowled over to learn that she had a long-lost sister Synonyms amaze, astonish, astound, surprise, dumbfound (also dumfound), flabbergast, floor, rock, shock, startle, stun, stupefy, thunderstrikeRelated Words befuddle, bewilder, blindside, blow away, confound, confuse, daze, discomfit, disconcert, dismay, jar, muddle, nonplus, perplex, shake up