This is the 3652nd most frequent Japanese word.
鳴らし
"鳴らし" means "ringing" or "sounding," often referring to the act of causing something to make a sound, like a bell or instrument.
In this sentence, '鳴らし' is used as part of the verb '鳴らす', meaning 'to ring or sound' an object, specifically a doorbell.
ドアベルを鳴らしてください。
Please ring the doorbell.
Here, '鳴らし' functions within the verb '鳴らす' to indicate causing the alarm to ring as a triggered action.
携帯電話のアラームを鳴らし忘れた。
I forgot to set the alarm on my phone to ring.
In this example, '鳴らし' as part of '鳴らす' implies producing a sound from the trumpet as a performative action.