The transfer function of the feedback path of a control system

To put coins into a parking meter or gas meter.

(idiomatic) To experience sympathy for, to sympathise with. / (idiomatic) To search for something by touching (as with one’s hand in a bag).

(archaic) The accelerator or gas pedal, so called when the throttle control was moved from the column to the floor.

(originally US, informal, frequently in the phrase 'get cold feet') A feeling of nervousness or anxiousness causing one to reconsider a decision about an upcoming event.

(sports) To feel the burning sensation arising in a muscle being intensely exercised; often used as an exhortation to extend oneself in physical exercise.

(electronics, engineering) A hermetically sealed connection between two volumes.

(of a fish or other aquatic creature) Feeding off plant and animal life found in the lowest regions of its habitat.

A fish or other aquatic creature that feeds off the bottom of its habitat; a flatfish.

(idiomatic) Resentment, anger.