Velocity evolution of SN 2020cxd. Upper panel shows the expansion velocities estimated from Hα P-Cygni minima (black stars) and FWHM (red stars), Hβ P-Cygni minima (yellow squares), [Ca II] λ7291 line FWHM (blue cross), FWHM of Ca II NIR triplet middle line (green diamonds), and [O I] λ6300 line FWHM (orange pentagons). Hα velocities for SN 2020cxd compared to other LL SNe discussed throughout the paper. A comparison with the normal Type II SN 1999em is shown in the lower panel. The x-axis shows the phase with respect to explosion. Line velocities of the other LL SNe II are taken from Pastorello et al. (2004) to Spiro et al. (2014).