Using 'suck up' can imply a person is being insincere or manipulative for personal gain.

Negative Connotation

'Suck up' is used in casual or informal conversations rather than formal settings.

Informal Speech

When someone is labeled a 'suck up', they're often viewed unfavorably by peers.

The phrase 'suck up' literally means to use suction to pull something in.

It often refers to the action a vacuum or similar machine performs.

Frequently used to describe how well a device or material cleans or absorbs.