1. support
2. back off
3. back down, withdraw, retreat, pull away, draw back, recede, pull back, retire, move back, back
4. confirm, corroborate, sustain, substantiate, support, affirm, copy
5. re-create, clog
5. choke off, clog up, congest, choke, foul, obstruct, obturate, impede, occlude, jam, block, close up