overplay (your) hand

mainly American

to try to get more advantages from a situation than you are likely to get.

I'm going to ask for promotion but I think it might be overplaying my hand to ask to work fewer hours as well.

• a bag lady
• a bag of bones
• a baker's dozen
• a balancing act
• a ball and chain
• a ball-breaker
• a ballpark estimate
• a ballpark figure
• a balls-up
• a banana republic
• a banana skin
• a Band-Aid
• a bang up job
• a baptism by fire
• a baptism of fire
• a bargaining chip
• a basket case
• a battle of nerves
• a battle of wills
• a battle of wits
• ABCs of
• ABCs of something
• a bean counter
• a bear hug
• a beast of burden