rub >> /rəb/
Definition: [transitive verb] Move one's hand or a cloth repeatedly back and forth on the surface of (something) with firm pressure.
Example: she rubbed her arm, where she had a large bruise
Definition: [noun] An act of rubbing.
Example: she pulled out a towel and gave her head a quick rub
Definition: [noun] A difficulty, especially one of central importance in a situation.
Example: that was the rub—she had not cared enough
Definition: [noun] (in lawn bowling) an uneven patch of ground that impedes or diverts a bowl.