This meaning refers to how heavy, solid, or substantial an object feels.
The tool has a reassuring heft.
She was surprised by the heft of the box.
This figurative meaning refers to authority, significance, seriousness, or persuasive power.
The report lacks enough evidence to give it heft.
Her support gave the campaign greater political heft.
This meaning refers to estimating weight by lifting or balancing an object in the hand.
He hefted the melon before choosing it.
She hefted both packages to compare them.