Consider a person who falls with their head coming into contact with the floor first before other parts of their body (back, legs, etc).
Do we say "She fell on her head", "She fell with her head onto the floor", "She fell and hit her head onto the floor", "She dived into the floor", "She fell & dived into the floor"? (And for "dive", do people do it on purpose not accidentally like "fall"?)
Best Answer
Common phrases (in Am. English)
"She fell on her head" - she fell landing on her head before any other parts of her body. "Landed on her head" is used similarly, but was used less frequently until ~2006.
"She fell head-first" - she fell with her head oriented downward/toward the object
"She fell and hit her head" - she fell and her head hits something
"She fell down [a well]" - When used with an object like "well" or "hole", "fell down" implies falling into that object.
"She fell down." - When used without an object, "fell down" generally implies the brief, discrete action of falling from a standing position on the ground. E.g.
Note: the phrase "fell down" is generally not preferred when expressing distance or duration. E.g.
"She dove to the floor" - She intentionally dove parallel to the ground, landing on the floor. For a visual, picture a sports star diving for a ball, or an action hero under fire diving to safety behind a large object. Unlike "dove into the floor", below, this has been used with some frequency in recent decades.
Other phrases from the question
NO: "She fell with her head onto the floor" - this is an awkward construction, and not one I have personally ever seen used.
NO: "She fell & dived into the floor" - also an awkward construction and not idiomatic. One verb will suffice, and "into" is probably not the right choice.
PROBABLY NOT: "She dove into the floor" - This could be used literally in a (fantasy?) context, where she literally passed into the floor. With care, it could perhaps be used metaphorically, maybe emphasizing the severity of her fall. Both of these are edge cases, however; this is less awkward than the prior examples, but still not a common/normal phrase.