| Answer | Crossword Clue |
|---|---|
| TONE | Strengthen, with "up" |
| BEEF | Strengthen, with "up" |
| PROP | Strengthen, with "up" |
| TONE | ... up: strengthen |
| bolstered | Support or strengthen; prop up |
| bolstering | Support or strengthen; prop up |
| underpin | to prop up or support from below; strengthen, as by reinforcing a foundation |
