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head up[′hed ‚əp]
To tighten bolts on a hatch cover or access hole plate to prevent leakage from or into an operating vessel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
To remove the lower branches from a tree or large shrub.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.