noun

ballast

ballast

The ship took on ballast to improve stability.

The ship took on ballast to improve stability.

Gravel is used as ballast for railway tracks.

Gravel is used as ballast for railway tracks.

((as sth.)) ballast Gravel is used as ballast for railway tracks.

Synonyms: weight, counterweight, stabilizer

From Middle Low German, possibly related to 'bare last' meaning 'mere load'.

Imagine a hot air 'ball'oon needing a 'last' minute weight to stay stable.

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