横綱【よこづな】
yokozuna (highest rank in sumo), grand champion, best in its field, crème de la crème, cream of the crop
綱領【こうりょう】
general plan, main points, summary, platform (e.g. for a campaign), mission statement
綱渡り【つなわたり】
tightrope walking, high-wire act, funambulism, treading a tightrope, walking on thin ice, pulling a risky balancing act
手綱【たづな】
reins, bridle, control, the reins (on)
綱紀【こうき】
law and order, (official) discipline