in glowing terms colours 成语

---

Sail under false colours

Someone who sails under false colours (colors) is hypocritical or pretends to be something they aren't in order to deceive people.

---

True colours

If someone shows their true colours, they show themselves as they really are. ('True colors' is the American spelling.)

---

Under false colours

If someone does something under false colours/colors, they pretend to be something they are not in order to deceive people so that they can succeed.

---

With flying colours|With flying colors

If you pass something with flying colours (colors), you pass easily, with a very high mark or grade.