as if treading (/walking)on (/upon) thin ice—pick one’s way carefully;pussyfoot ❍ 战战兢兢，如临深渊，～。(《诗经·小雅·小旻》)❶With fear and caution should we tread,like men above some torrent’s bed,or those who go upon thin ice. ❷We should be apprehensive and careful.|As if we were on the brink of a deep gulf,|As if we weretreading on thin ice.
如履薄冰
as if treading on thin ice—acting with extreme caution