signal verb

1 move your arms to give a signal

ADV. frantically, wildly She signalled frantically to us.

PREP. for He raised his hand and signalled for the waiter. | to She signalled to the bus driver to stop.

2 show/mark sth

ADV. clearly These changes clearly signal the end of the welfare state as we know it. | effectively | not necessarily A change of mind in one instance does not necessarily signal a change in overall policy.