fling oneself at someone
Also, fling or throw oneself at someone's head. Try openly to make someone love one. For example, She was constantly phoning him and inviting him over, really flinging herself at him, or Mom said she should stop throwing herself at his head.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.