What does «despegar» mean in Spanish?

Separate what is glued.

Examples of use in Spanish: "despegar varias hojas de un almanaque".
Leave the ground an airplane.

Examples of use in Spanish: "despegar el avión de París-Madrid".
(despegarse) To detach oneself, to move away.

Examples of use in Spanish: "despegarse de sus amigos, de sus hermanos".