if the heat is on, you are very busy or in a difficult situation.

There are only 3 weeks left before the deadline, so the heat is on.

• seize up
• self-made man
• sell a bill of goods
• sell down the river
• sell like hot cakes
• sell like hotcakes
• sell out
• sell out of
• sell out of something
• sell out someone
• sell out something
• sell short
• sell someone a bill of goods
• sell someone down the river
• sell someone short
• sell something short
• sell soul
• sell soul to the devil
• sell your soul
• sell your soul to the devil
• send a message
• send around
• send around something
• send a signal
• send away for