precarious - in a dangerous state because of not being safe or not being held in place firmly, reckon - to think or believe, fingers crossed - when you hope very much that something will happen in the way that you want:, attempt - the act of trying to do something, especially something difficult, roost - go somewhere to rest or sleep (about birds), cling to - to hold tightly or to stick, give it a bash - to try or attempt (something), it's a shame - it's sad or a pity, ledge - a narrow, flat area like a shelf that sticks out from a building, cliff, or other vertical surface:,

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