Be on and Mug

Be on verb - Appear in a show, on T.V. or radio.

Mug and be on are semantically related. in act topic. In some cases you can use "Mug" instead a verb phrase "Be on", when it comes to topics like entertain by playing a role.

Mug verb - To distort one's face.

Be on and mug are semantically related. Sometimes you can use "Be on" instead a verb "Mug".