From Longman Dictionary of Contemporary Englishpitch into somebody/something phrasal verb British English informal1 ATTACKto suddenly start criticizing someone or hitting them She pitched into me as soon as I started to speak.2 to start doing something, especially quickly and eagerly Rick pitched into decorating the house at once. → pitch→ See Verb table
Examples from the Corpus
pitch into • If this is achieved, then the fact that the ball is pitching into an upslope means there's very little run.• She felt weightless as they pitched into empty air.• Or that wicked sidearm delivery that turned right-handed hitters who liked to dive into pitches into paratroopers.• I got a very bad feeling as we pitched into the bathroom and-fumbled for the mouthwash.• I pitched into the chores with a light heart, singing to myself as I worked.• You had to drive leftish to position yourself far enough down the fairway to get a pitch into the green.• The submersible, hatch open, pitched into the sea.• But they are not eager to pitch into two helpless dummies strapped to chairs. 