Within grammaticalization theory it is generally accepted that the process is unidirectional; Ns (nouns) can develop into Pops (postpositions), but not vice versa. The concept of decategorialization applies to the extent to which e.g. the Ns cease to survive as Ns, and survive only as Pops during and after the grammaticalization process.

Gliese 876 affords us by far our most detailed and accurate map of any extrasolar planetary system in the solar neighborhood, and […] it is reassuring to see a kinship in the most fundamental property of system coplanarity.

As Levinson (1983: 334) points out, signs of dispreference in turn taking include: (a) Delays: notably a pause, or a time gap, before the responder replies to the preceding turn […]

The judge recused herself from that case, citing a possible conflict of interest.