acorn /āˈkörn/

The fruit of the oak

āˈcorned adjective

aˈcorn-cup noun

The woody cup-shaped part of an acorn that holds the nut

aˈcorn-shell or aˈcorn-barnacle noun

A sedentary crustacean of the genus Balanus

acorn worm noun

Any of various wormlike sea-animals (enteropneusts) of the Hemichordata which have a proboscis and collar somewhat like an acorn in shape

• have someone over a barrel
• have someone's back
• have someone's ear
• have someone's guts
• have someone's guts for garters
• have someone's measure
• have someone's number
• have something against
• have something going for one
• have taped
• have the advantage of
• have the ball at one's feet
• have the best of it
• have the black ox tread on one's foot
• have the bulge on someone
• have the cards stacked against
• have the cards stacked in favour of
• have the edge
• have the goods on
• have the heart
• have the hots for
• have the jitters
• have the jump on
• have the key of the door
• have the key of the street