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(as) comfortable as an old shoe
Very familiar or comfortable, especially in an agreeably unpretentious or unrestrained manner. This car may have seen better years, but it's still comfortable as an old shoe to drive around in.
The state of having enough money to live well. We used to have barely enough money to pay rent, but ever since Pat got that promotion, we've been living in comfortable circumstances.
comfortable in (one's) own skin
Displaying a relaxed confidence in and clear understanding of oneself and one's abilities, especially when presenting oneself to or interacting with other people. Though his girlfriend's group of friends are all older and more established in life, he is comfortable enough in his own skin to have no problem mingling with them at parties. Janet is so comfortable in her own skin that I have no doubt that she'll find her ideal path in life.
hold (one) at a comfortable distance
To keep one away, either physically or figuratively, in order to afford a level of safety or security or to prevent intimacy. He doesn't like to be touched, so please hold him at a comfortable distance.
nice and (something)
Very something. Used to emphasize how nice something is because of the particular quality named after "and." I love your new house! It's nice and bright inside! Ah, this lemonade is nice and cold—just the thing for such a hot day.
slip into something more comfortable
A set phrase usually said seductively to a prospective sexual partner. Why don't you pour the wine while I slip into something more comfortable?
*comfortable as an old shoe
Cliché very comfortable; very comforting and familiar. (*Also: as ~.) My old house may seem small to you, but I think it's cozy. It's as comfortable as an old shoe.
comfortable as an old shoe, as
Familiar and very much at ease, as in Kathy's really enjoying her third summer at the same camp-for her it's comfortable as an old shoe . This simile was once put as easy as an old shoe, first recorded in J. T. Brockett's North Country Glossary (1825). It was most often applied to friends, as in the proverb Old shoes are easy, old friends are best, but today it is used more broadly for easy familiarity in any situation.