get to the bottom of (something)

to discover the truth about a situation.

The family finally got to the bottom of why their boy was killed. (often + question word)

How will investigators get to the bottom of the affair with so little evidence?

• someone's answer someone
• someone's answer something
• someone's ass is on the line
• someone's bag of tricks
• someone's bark is worse than bite
• someone's bark is worse than their bite
• someone's beauty sleep
• someone's best bet
• someone's better half
• someone's blood boils
• someone's blood is up
• someone's blood runs cold
• someone's bottom drawer
• someone's bottom line
• someone's bread and butter
• someone's butt is on the line
• someone's claim to fame
• someone's days are numbered
• someone's ears are flapping
• someone's eyes are bigger than belly
• someone's eyes are bigger than stomach
• someone's eyes are bigger than their belly
• someone's eyes are bigger than their stomach
• someone's eyes are out on stalks
• someone's face doesn't fit