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to be sticky; to be adhesive
to persevere; to persist; to stick to; to hold out; to linger
粘り強く練習を毎日続けています。
I'm continuing practice persistently.
最後まで粘って粘り強く交渉を続けました。
I persisted to the end and continued negotiating.
彼は最後まで粘った。
He held on until the very end.