Radical 糸
10 strokes
緊
firm
(697b) + thread 糸 (607b) = tight 紧
紧张 (173) jǐnzhāng nervous, tense
[要紧 (101) yàojǐn important, urgent]
[不要紧 (9, 101) bú yàojǐn Do not …]

He takes a firm hold on the thread and pulls it tight. / Teddy then steps gingerly onto it and edges along (thinking that perhaps he’s not cut out for tightrope walking after all!)