Change one letter.

[Jurassicspark]

tank

 

[Mottie]

Bank

 

[Jurassicspark]

band

 

[Slime]

Hand.

 

[Jurassicspark]

land

 

[Slime]

Lend.

 

[Jurassicspark]

bend

 

[Mottie]

Tend

 

[Jurassicspark]

tent

 

[Slime]

Bent.

 

[Jurassicspark]

bant

 

[Slime]

Want.

 

[Mottie]

Rant

 

[Slime]

Runt.

 

[Mottie]

Gunt.

When one of Mrs Motties friends is putting on a bit of weight, she says "I’ll have to go on a diet - I’m getting a bit of a gunt again". It’s a portmanteau of gut and…well, I’ll let you guess the second half.