Refers to a secure position or established standing, often in a competitive or social context. Can be literal or figurative.
彼は政界で確固たる地歩を築いた。
He established a firm foothold in the political world.
新市場での地歩を固めるために、積極的な投
To solidify our footing in the new market, aggressive investment is necessary.
Compound of 地 (ground, land) and 歩 (step, walk), literally 'ground step'. The figurative meaning of a secure position likely developed from the idea of having a place to stand.