upasarpanam
upasarpaṇam — the approaching; SB 3.14.15
vaikuṇṭha-pāda-mūla-upasarpaṇam — the approaching of the shelter of Lord Viṣṇu's lotus feet; SB 6.17.14
pāda-upasarpaṇam — approaching the lotus feet; SB 7.6.2
pada-upasarpaṇam — worship of the lotus feet; SB 8.24.30