buttress

Words with a similar base: buttress, buttressing

'buttress'

[buttress.n.01] as in: a support usually of stone or brick; supports the wall of a building

'buttress'

[buttress.v.01] as in: reinforce with a buttress

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Examples:
Buttress the church

'buttress'

[buttress.v.02] as in: make stronger or defensible

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Examples:
buttress your thesis