wave

WATER

B1a line of higher water that moves across the surface of the sea

• The waves were too big for swimming.

HAND

B1a movement of your hand from side to side, used to say hello or goodbye

• She gave us a wave from the window.

SUDDEN INCREASE

B2a sudden increase in an activity, feeling or number of events

• There has been a wave of crime in the area.

ENERGY

B2the form in which some types of energy move

• Radio waves can travel very far.

A2to move your hand from side to side to say hello or goodbye or to get attention

• She waved goodbye.
• He waved at me across the street.