1. That branch of physics which treats of the mechanics of liquids, or of their laws of equilibrium and of motion

Encyclopedia: Hydromechanics

• out of action
• out of bounds
• out of breath
• out of doors
• out of gear
• out of hand
• out of it
• out of keeping
• out of line
• out of nothing
• out of order
• out of place
• out of play
• out of practice
• out of print
• out of reach
• out of sight
• out of sorts
• out of stock
• out of the blue
• out of the frying pan and into the fire
• out of the frying pan into the fire
• out of the question
• out of the way
• out of thin air