Guarantee
noun, する verb
Evidence that something will be preserved is a form of guarantee, at least as long as the evidence is strong enough. Also, 保 also means guarantee, so use that to help you to remember this word.
ほしょう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
うまく組しきを固められる保証はありませんよ。
There is no guarantee that I could strengthen the organization well though.
私はワニカニのライフタイムメンバーですが、トーフグが五年後もあるなんて保証はないから本当にライフタイムでワニカニが使えるなんて思っていませんよ。
I am a lifetime member of WaniKani, but I don't really think I can use it for a lifetime, as there is no guarantee that Tofugu will still be around in five years.
恐らく灰色熊が近寄ってくるかと思いますが、とても安全なのでご安心ください。ご保証致します。
The grizzly bears will probably approach you, but don’t worry. It’s very, very safe. We guarantee it.