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1. To secure oneself to or into something with a strap, harness, or seat belt. I just need to strap in before you start driving. We all sat into the seats of the roller coaster and began strapping in.
2. To secure someone or something to or into something with a strap, harness, or seat belt. A noun or pronoun can be used between "strap" or "in." Make sure you strap the kids in properly. He didn't strap in the cargo and it all ended up falling over and breaking in transit.
3. slang Brace yourself; get ready, especially for something shocking or surprising, whether in a good or a bad way. Strap in, ladies and gentlemen—these financial results are not great. Strap in for one of the wildest action films of the year!
strap someone or something in(to) somethingand strap someone or something in
to tie or bind someone or something into something. Mother strapped little Jimmy into his seat. She strapped in Jimmy.
1. To secure someone or something with a strap, especially a seat belt: Be sure to strap in the children before the car starts moving. We loaded the baggage onto the truck and strapped it in with a cord.
2. To secure oneself with a strap, especially a seat belt: The pilot climbed into the cockpit and strapped in.