Definitions:

1. Reaching up to the waist level of a person, typically used to describe the height of objects, vegetation, water, or obstacles. ADJECTIVE
   • The corn was already waist-high by mid-July.
2. Up to the waist. ADVERB
   • The flood waters rose to a waist-high level in some streets.

Synonyms:

• mid-height
• up to the waist
• waist-deep
• waist-level