Sail under false colours verb phrase
To deliberately hide one's true nature, intentions or purposes
Some scammers sailed under false colors to deceive money via using fake emergencies.
Some bad men sail under false colours to pretend to be a family friend or relatives to steal children.
Someone who looks gentle and sweet but in fact is severe and forceful
To maintain someone's attention or to keep them waiting in a state of uncertainty.
Very dishonest and deceptive
This idiom means that someone does not share what they think or feel with others.
The verb "sail" must be conjugated according to its tense.
This phrase hints at pirates who often sailed under the national flag of the ship they planned on attacking.