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To launch into something (such as a speech, a song, a presentation) is to start doing or saying something in a very energetic or enthusiastic way.

Examples of use:
1. She walked into the office and suddenly launched into stories about her adventures on holiday.

2. He was just launching into his presentation when someone’s mobile phone rang.

If you launch yourself into something you become involved in it an enthusiastic way.

Examples of use:
1. She launched herself into the project for the new office development.

2. He launched himself enthusiastically into the housework.

infinitive – launch into

present simple – launch into and launches into

-ing form – launching into

past simple – launched into

past participle – launched into

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