4 Pics 1 Word Level 1672

Answer:
Whistle
Hint
What is the answer to the 4 Pics 1 Word level with An engine whistle, Man blowing a whistle, A silver whistle, and Man making a stopping gesture and blowing a whistle?

Hint
What is the answer to the 4 Pics 1 Word level with An engine whistle, Man blowing a whistle, A silver whistle, and Man making a stopping gesture and blowing a whistle?