lend (或 give) colour to

make something seem true or probable

使顯得可信（或可能）

this lent colour and credibility to his defence.

這使他的辯護更具可信性。

sail under false colours

disguise one's true nature or intentions

掩蓋自己的本性；掩飾自己的真實意圖

show one's true colours

reveal one's real character or intentions, especially when these are disreputable or dishonourable

露出真面目；露出真正的本性（或意圖）

under colour of

under the pretext of

以…為借口（或托詞）

with flying colours