This is the 13394th most frequent Russian word.
нажимает
"Presses" or "pushes."
The word 'нажимает' is used to describe the action of pressing something physically, as in a button.
Он нажимает на кнопку, чтобы включить свет.
He presses the button to turn on the light.
Here, 'нажимает' metaphorically describes the muscle exerting pressure or being taut.
Мышца нажимает и напряжена после тренировки.
The muscle presses and is tense after the workout.
In this context, 'нажимает' is used figuratively to express applying pressure to someone to motivate or compel them to act.