| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Erector operator | Occupations | Sets up and operates equipment to advance steel framework (shield) within tunnel during construction: Turns handcrank to regulate hydraulic valves that advance jacks used to push forward tunnel shield that supports overlying ground during tunnel construction. Moves levers to regulate movement of steel arm attached to shield to lift metal segments of $T3tunnel heading$T1 into position. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
